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Align lens flare with sky-locked sun rendering

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- anchor flare sun position to camera + sun direction to match celestial billboard projection
- remove world-space parallax drift that caused flare/sun misalignment while moving
This commit is contained in:
Kelsi 2026-02-21 03:23:24 -08:00
parent 8156942b66
commit 7a4a21c8bf
1 changed files with 11 additions and 2 deletions
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13
src/rendering/lens_flare.cpp
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@ -215,14 +215,23 @@ void LensFlare::render(const Camera& camera, const glm::vec3& sunPosition, float
return;
}
// Sun billboard rendering is sky-locked (view translation removed), so anchor
// flare projection to camera position along sun direction to avoid parallax drift.
glm::vec3 sunDir = sunPosition;
if (glm::length(sunDir) < 0.0001f) {
return;
}
sunDir = glm::normalize(sunDir);
glm::vec3 anchoredSunPos = camera.getPosition() + sunDir * 800.0f;
// Calculate sun visibility
float visibility = calculateSunVisibility(camera, sunPosition);
float visibility = calculateSunVisibility(camera, anchoredSunPos);
if (visibility < 0.01f) {
return;
}
// Get sun screen position
glm::vec2 sunScreen = worldToScreen(camera, sunPosition);
glm::vec2 sunScreen = worldToScreen(camera, anchoredSunPos);
glm::vec2 screenCenter(0.0f, 0.0f);
// Vector from sun to screen center